3D-FEM Numerical Simulation and Back Analysis of a Tunnel Excavated with Bench Method Considering Tuff’s Time-Dependency—A Case History: Study on the Intake Section of Qikeng Tunnel in Yuhang County, Zhejiang Province

2021 ◽  
Vol 10 (10) ◽  
pp. 994-1005
Author(s):  
佳锋 沈
Keyword(s):  
Numerical Simulation ◽  
Case History ◽  
Back Analysis ◽  
Zhejiang Province ◽  
Time Dependency ◽  
3D Fem ◽  
Fem Numerical Simulation

Parabolic-Apex Numerical Back-Analysis of Mechanics Parameters of Surrounding Rock

2012 ◽  
Vol 204-208 ◽  
pp. 196-201 ◽  
Author(s):  
Jian Cong Xu ◽  
Yi Wei Xu
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Pressure Coefficient ◽  
Back Analysis ◽  
Surrounding Rock ◽  
In Situ Monitoring ◽  
Monitoring Data ◽  
3D Fem ◽  
Physical Mechanics

The parabolic-apex numerical back-analysis method (PNBM) was proposed to obtain such physical-mechanics parameters as Young's modulus and lateral pressure coefficient of surrounding rock by 3D FEM numerical analysis based on in-situ monitoring data. Taking Xiang-an Subsea Tunnel (located in Xiamen, Fujian Province, China) for example, adopting the PNBM using ABAQUS software, three dimensional elastic-plastic FEM-PNBM of tunnel surrounding rock was validated using in-situ monitoring data. The results show as follows: Using the PNBM, not only may high calculation precision be obtained, better meeting the demand of actual projects, but also more reasonable and reliable physical mechanics indices of surrounding rock such as Young's modulus and lateral confinement pressure coefficient, may be obtained. The applicability and the simplicity of this proposed method also support its usefulness.

Uncertainty in Back Analysis of Slopes: Kettleman Hills Case History

1998 ◽  
Vol 124 (12) ◽  
pp. 1167-1176 ◽  
Author(s):  
Robert B. Gilbert ◽  
Stephen G. Wright ◽  
Eric Liedtke
Keyword(s):  
Case History ◽  
Back Analysis

FEM numerical simulation of the warm and hot upsetting sliding test

2010 ◽  
Vol 3 (S1) ◽  
pp. 315-318
Author(s):  
E. Vidal-Sallé ◽  
M. Dubar ◽  
J-C. Boyer ◽  
L. Dubar
Keyword(s):  
Numerical Simulation ◽  
Sliding Test ◽  
Fem Numerical Simulation

Numerical Simulation of Expansion Effect of MgO Concrete

2012 ◽  
Vol 212-213 ◽  
pp. 801-804 ◽  
Author(s):  
Jian Hua Cui ◽  
Han Jiang Xiao ◽  
Jie Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Control ◽  
Temperature Drop ◽  
Dam Construction ◽  
Construction Technology ◽  
3D Fem ◽  
Fem Method ◽  
Good For ◽  
Mgo Concrete ◽  
Expansion Effect

The expansion effect of the MgO concrete must meet the requirement of the design for the temperature control. In this paper, its influence to the construction stress is studied using 3D FEM method. Results show that the expansion of MgO at later age is good for compensating the shrinkage induced by temperature drop and the expansion of MgO can improve the stress status in the constrained zones but may worsen the stress status in other zones. This provides the reference for popularizing dam construction technology with MgO concrete.

Study on FEM Numerical Simulation and Strain Monitoring of Tunnel Secondary Lining

2014 ◽  
Vol 580-583 ◽  
pp. 1105-1111
Author(s):  
Ying Na Li ◽  
Meng Liu ◽  
Sheng Wu ◽  
Hao Liu ◽  
Jian Kun Su ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Comparative Study ◽  
Monitoring Method ◽  
Strain Monitoring ◽  
Site Monitoring ◽  
Secondary Lining ◽  
Rock Tunnel ◽  
The Comparative Study ◽  
Fem Numerical Simulation

Safety of secondary lining is of utmost importance to tunnel engineering quality as the main load-bearing structure and the last waterproof line of rock tunnel under type III. The comparative study of strain state results from FEM numerical simulation and on-site monitoring in Yunnan Tianxin Tunnel was conducted to obtain the stress regularity of tunnel lining. The results showed that except vault, the strain states of secondary lining obtained by numerical simulation and on-site monitoring were consistent. The strain value of on-site monitoring was approximately 60%~70% to the simulation value. And the strain value of right side was greater than the value of the corresponding location on the left side. It’s noticed that high strain were found in tunnel haunch and arch springing. Great attention should be paid to arch springing for the largest strain value. The strain monitoring value of vault (309.83με~327.23με) has been detected larger than simulation value (209.37με), which matches well the crack phenomenon of vault. Therefore it’s significant to focus on the long-term monitoring of vault. The defects of single on-site monitoring method such as poor predictability were made up effectively by comparative study. The results achieved can be recommended for similar projects.

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